水土作用对桂林重塑红黏土工程性质试验研究

摘要

红黏土在土类划分上属于特殊性土,由于其特殊的成因过程及成因环境,水土作用对桂林重塑红黏土的工程性质具有一定影响,通过室内实验研究水土作用对桂林重塑红黏土界限含水量以及胀缩性的影响,探究其内在作用机理.试验结果表明,经过浸泡7 d后的土体的界限含水量均会改变,随着溶液浓度的增大在NaCl和CaCl2溶液中浸泡的土样液限和塑性指数增大、塑限减小,且随着酸性和碱性的增强会进一步加大这一趋势.而在NaCl和CaCl2溶液中浸泡的土样的自由膨胀率、线缩率、体缩率会随着溶液浓度的升高而增大,其中自由膨胀率在酸性相同条件下随着pH的减小而增大,在碱性环境中自由膨胀率随着pH的升高而增大,线缩率和体缩率则无明显规律.%Due to the special cause of process and environment, red clay is divided into peculiar soil.Soil and water effects on remodeling projects Guilin of red clay has a significant impact.Interior remodeling experimental study of red clay soil and water effects on the impact of marginal moisture content and swell-shrinking property of Guilin, was presanted so that can be studied on inner mechanism of remodeling red clay.The results showed that, after soaking the critical moisture content of soil will change in sodium chloride solution, with the increase of solution concentration and calcium chloride solution soak the soil samples of liquid limit and plastic index, plastic limit decreases, and with the augmentation of the acidic and alkaline will further strengthen the trend.At the same time, soil samples free expansion rate, shrinking ratio, volume shrinking ratio will increase with the increase of solution concentration,Including free expansion rate in acid under the same conditions with the decrease of the pH value increases,shrinking ratio and volume shrinking ratio have no obvious regularity,under the same conditions of alkaline free expansion rate increases with the increase of pH value, shrinking ratio and volume shrinking ratio have no obvious regularity.